Tropical Storm Erin is expected to intensify into the first major hurricane of the season, according to the National Hurrican Center.

Erin is moving fast across the Atlantic, at 22 mph. It's forecast not only to become the Atlantic season's first hurricane, but also a major hurricane. A major hurricane is one that's a Category 3 or higher, with maximum sustained winds of at least 111 mph.

Tropical Storm Erin continues to move quickly west, and is expected to become the first hurricane of the Atlantic season.